One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,7)(4,6)(5,8)(9,10)(11,16)(12,14)(13,15)(17,18,23,27)(19,24,28,31)(20,25,21,30)(22,26,29,32)(1,3)(2,5)(4,8)(6,7)(17,19,23,28)(18,24,27,31)(20,29,21,22)(25,32,30,26)(9,11,13,12)(10,14,15,16)(17,20,22,19,23,21,29,28)(18,25,26,24,27,30,32,31)(2,6)(5,7) involution — undirected(3,8)(5,7)(9,12,13,11)(10,14,15,16)(17,21,22,28,23,20,29,19)(18,25,26,24,27,30,32,31)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.